🌌 Stone's Star System Generator

Asteroid Belt

Center: 3.56 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 7.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 828.3

Radius: 12.7

Gravity: 5.14 G

Time & Orbit

Eccentricity (e): 0.011

Orbit Range: 7.03 AU - 7.19 AU

Year: 6633 Days

Day: 10.5 Hours

Environment

Temp: -151 °C

Axial Tilt: 12.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 70,873,027 km

• M1: 175,927 km (0.089 R)
• M2: 643,271 km (0.108 R)
• M3: 784,192 km (0.042 R)
• M4: 936,632 km (0.051 R)
• M5: 1,066,184 km (0.118 R)
• M6: 1,219,821 km (0.115 R)
• M7: 1,436,588 km (0.117 R)
• M8: 1,569,132 km (0.073 R)
• M9: 1,705,865 km (0.06 R)
• M10: 1,887,925 km (0.056 R)
• M11: 1,970,952 km (0.112 R)
• M12: 2,140,895 km (0.092 R)
• M13: 2,382,645 km (0.052 R)
• M14: 2,656,709 km (0.057 R)
• M15: 2,893,073 km (0.085 R)
• M16: 3,013,948 km (0.094 R)
• M17: 4,067,865 km (0.029 R)
• M18: 4,258,603 km (0.083 R)
• M19: 5,168,008 km (0.04 R)
• M20: 5,464,361 km (0.114 R)
• M21: 5,554,419 km (0.116 R)
• M22: 6,418,646 km (0.115 R)
• M23: 6,866,393 km (0.119 R)
• M24: 7,291,400 km (0.086 R)
• M25: 8,304,776 km (0.053 R)
• M26: 8,408,597 km (0.105 R)
• M27: 9,147,162 km (0.114 R)
• M28: 9,979,973 km (0.097 R)
• M29: 10,090,376 km (0.11 R)
• M30: 10,312,529 km (0.064 R)
• M31: 10,648,676 km (0.091 R)
• M32: 10,950,564 km (0.108 R)
• M33: 11,216,998 km (0.066 R)
• M34: 11,524,122 km (0.089 R)
• M35: 11,834,239 km (0.113 R)
• M36: 12,621,124 km (0.102 R)
• M37: 12,820,538 km (0.089 R)
• M38: 13,547,134 km (0.082 R)
• M39: 13,833,315 km (0.103 R)
• M40: 14,245,607 km (0.097 R)
• M41: 14,370,072 km (0.076 R)
• M42: 15,677,558 km (0.109 R)
• M43: 16,064,268 km (0.064 R)
• M44: 16,237,203 km (0.064 R)
• M45: 16,891,096 km (0.028 R)
• M46: 17,598,095 km (0.094 R)
• M47: 18,000,065 km (0.088 R)
• M48: 18,089,674 km (0.1 R)
• M49: 18,314,669 km (0.079 R)
• M50: 18,585,890 km (0.102 R)
• M51: 19,040,967 km (0.086 R)
• M52: 19,132,371 km (0.104 R)
• M53: 20,008,416 km (0.102 R)
• M54: 20,101,316 km (0.091 R)
• M55: 20,521,537 km (0.095 R)
• M56: 21,418,077 km (0.081 R)
• M57: 22,183,120 km (0.093 R)
• M58: 22,908,371 km (0.082 R)
• M59: 23,103,147 km (0.076 R)
• M60: 23,396,209 km (0.088 R)
• M61: 23,986,223 km (0.062 R)
• M62: 24,134,475 km (0.089 R)
• M63: 24,332,542 km (0.099 R)
• M64: 24,431,875 km (0.07 R)
• M65: 25,080,532 km (0.089 R)
• M66: 25,180,762 km (0.076 R)
• M67: 26,038,557 km (0.087 R)
• M68: 27,111,622 km (0.06 R)
• M69: 27,420,841 km (0.082 R)
• M70: 27,679,346 km (0.105 R)
• M71: 29,247,880 km (0.062 R)
• M72: 30,149,356 km (0.069 R)
• M73: 30,576,758 km (0.104 R)
• M74: 30,684,019 km (0.056 R)
• M75: 33,901,421 km (0.116 R)
• M76: 34,345,876 km (0.09 R)
• M77: 35,860,255 km (0.114 R)
• M78: 36,369,935 km (0.058 R)
• M79: 36,996,002 km (0.067 R)

Planet 2 - Gas Giant

Semi-Major Axis: 7.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 28.4

Radius: 10.6

Gravity: 0.25 G

Time & Orbit

Eccentricity (e): 0.011

Orbit Range: 7.11 AU - 7.27 AU

Year: 6745 Days

Day: 7.2 Hours

Environment

Temp: -157 °C

Axial Tilt: 39.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (48)

Outer Limit: 70,873,027 km

• M1: 132,993 km (0.027 R)
• M2: 207,492 km (0.078 R)
• M3: 484,248 km (0.111 R)
• M4: 758,162 km (0.064 R)
• M5: 939,923 km (0.067 R)
• M6: 1,169,407 km (0.107 R)
• M7: 1,252,733 km (0.114 R)
• M8: 1,373,159 km (0.038 R)
• M9: 1,672,504 km (0.113 R)
• M10: 1,805,945 km (0.087 R)
• M11: 1,923,081 km (0.043 R)
• M12: 2,364,245 km (0.078 R)
• M13: 2,471,357 km (0.114 R)
• M14: 2,701,738 km (0.07 R)
• M15: 2,813,936 km (0.074 R)
• M16: 2,996,894 km (0.106 R)
• M17: 3,231,015 km (0.078 R)
• M18: 3,410,532 km (0.118 R)
• M19: 3,544,422 km (0.092 R)
• M20: 4,071,456 km (0.115 R)
• M21: 4,690,342 km (0.048 R)
• M22: 4,798,651 km (0.12 R)
• M23: 5,395,247 km (0.104 R)
• M24: 5,466,157 km (0.099 R)
• M25: 5,781,808 km (0.083 R)
• M26: 5,854,363 km (0.112 R)
• M27: 6,281,465 km (0.083 R)
• M28: 6,371,074 km (0.113 R)
• M29: 6,446,172 km (0.108 R)
• M30: 7,275,094 km (0.099 R)
• M31: 7,400,756 km (0.08 R)
• M32: 7,479,744 km (0.093 R)
• M33: 7,558,881 km (0.078 R)
• M34: 7,638,467 km (0.089 R)
• M35: 7,782,231 km (0.036 R)
• M36: 8,317,193 km (0.108 R)
• M37: 8,448,689 km (0.113 R)
• M38: 8,647,206 km (0.109 R)
• M39: 9,065,781 km (0.112 R)
• M40: 9,766,647 km (0.094 R)
• M41: 9,887,970 km (0.095 R)
• M42: 10,414,106 km (0.102 R)
• M43: 10,949,218 km (0.118 R)
• M44: 11,220,139 km (0.112 R)
• M45: 11,584,859 km (0.036 R)
• M46: 11,824,066 km (0.102 R)
• M47: 11,972,018 km (0.091 R)
• M48: 12,664,657 km (0.102 R)

Planet 3 - Gas Giant

Semi-Major Axis: 8.01 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 798.2

Radius: 9.8

Gravity: 8.31 G

Time & Orbit

Eccentricity (e): 0.234

Orbit Range: 6.14 AU - 9.88 AU

Year: 7931 Days

Day: 8.3 Hours

Environment

Temp: -147 °C

Axial Tilt: 31.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 70,873,027 km

• M1: 152,739 km (0.102 R)
• M2: 217,366 km (0.093 R)
• M3: 787,184 km (0.103 R)
• M4: 954,434 km (0.031 R)
• M5: 1,737,130 km (0.119 R)
• M6: 1,802,505 km (0.037 R)
• M7: 1,958,236 km (0.104 R)
• M8: 2,235,740 km (0.112 R)
• M9: 2,307,248 km (0.113 R)
• M10: 2,550,793 km (0.044 R)
• M11: 2,802,716 km (0.094 R)
• M12: 3,634,779 km (0.057 R)
• M13: 4,092,699 km (0.085 R)
• M14: 4,478,212 km (0.117 R)
• M15: 4,844,577 km (0.081 R)
• M16: 5,125,672 km (0.075 R)
• M17: 5,541,105 km (0.074 R)
• M18: 5,835,215 km (0.072 R)
• M19: 5,967,609 km (0.097 R)
• M20: 6,034,180 km (0.065 R)
• M21: 6,404,584 km (0.081 R)
• M22: 6,609,832 km (0.097 R)
• M23: 7,097,222 km (0.104 R)
• M24: 7,238,592 km (0.105 R)
• M25: 7,524,175 km (0.119 R)
• M26: 7,740,792 km (0.058 R)
• M27: 7,849,999 km (0.096 R)
• M28: 7,959,504 km (0.069 R)
• M29: 8,032,957 km (0.111 R)
• M30: 9,121,880 km (0.049 R)
• M31: 9,625,127 km (0.102 R)
• M32: 10,097,557 km (0.066 R)
• M33: 10,336,614 km (0.068 R)
• M34: 10,820,414 km (0.085 R)
• M35: 11,352,982 km (0.101 R)
• M36: 11,643,202 km (0.111 R)
• M37: 11,768,416 km (0.112 R)
• M38: 11,893,928 km (0.118 R)
• M39: 12,742,747 km (0.104 R)
• M40: 13,831,071 km (0.066 R)
• M41: 14,230,049 km (0.089 R)
• M42: 14,994,195 km (0.118 R)
• M43: 16,328,308 km (0.055 R)
• M44: 16,703,051 km (0.084 R)
• M45: 18,036,716 km (0.097 R)
• M46: 18,230,146 km (0.055 R)
• M47: 19,901,005 km (0.108 R)
• M48: 20,050,752 km (0.095 R)
• M49: 20,653,632 km (0.06 R)
• M50: 21,109,756 km (0.052 R)
• M51: 21,211,482 km (0.111 R)
• M52: 21,313,508 km (0.107 R)
• M53: 22,653,755 km (0.088 R)
• M54: 23,597,718 km (0.067 R)
• M55: 25,469,486 km (0.104 R)
• M56: 25,577,945 km (0.076 R)
• M57: 26,395,796 km (0.049 R)
• M58: 26,725,360 km (0.113 R)
• M59: 27,001,069 km (0.074 R)
• M60: 27,666,481 km (0.11 R)
• M61: 27,833,731 km (0.083 R)
• M62: 29,296,948 km (0.112 R)
• M63: 30,209,944 km (0.094 R)
• M64: 30,382,131 km (0.106 R)
• M65: 31,596,566 km (0.1 R)
• M66: 31,829,789 km (0.083 R)
• M67: 31,946,625 km (0.062 R)
• M68: 32,239,239 km (0.087 R)
• M69: 32,650,334 km (0.117 R)
• M70: 33,953,780 km (0.04 R)
• M71: 34,431,895 km (0.102 R)
• M72: 34,731,838 km (0.09 R)
• M73: 34,912,253 km (0.066 R)
• M74: 35,334,568 km (0.085 R)
• M75: 35,515,881 km (0.081 R)
• M76: 35,758,379 km (0.038 R)
• M77: 36,062,212 km (0.055 R)
• M78: 36,672,422 km (0.025 R)
• M79: 38,585,480 km (0.089 R)
• M80: 38,772,477 km (0.05 R)
• M81: 40,784,419 km (0.099 R)
• M82: 42,636,889 km (0.063 R)
• M83: 42,701,216 km (0.06 R)

Asteroid Belt

Center: 8.32 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 4 - Gas Giant

Semi-Major Axis: 8.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 460.1

Radius: 14.2

Gravity: 2.28 G

Time & Orbit

Eccentricity (e): 0.209

Orbit Range: 6.83 AU - 10.43 AU

Year: 8869 Days

Day: 10.4 Hours

Environment

Temp: -156 °C

Axial Tilt: 6.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 70,873,027 km

• M1: 347,665 km (0.074 R)
• M2: 607,816 km (0.087 R)
• M3: 757,713 km (0.112 R)
• M4: 1,183,618 km (0.043 R)
• M5: 1,359,994 km (0.094 R)
• M6: 1,451,698 km (0.081 R)
• M7: 1,943,127 km (0.101 R)
• M8: 2,328,491 km (0.036 R)
• M9: 2,599,263 km (0.083 R)
• M10: 2,976,399 km (0.062 R)
• M11: 3,295,940 km (0.118 R)
• M12: 3,396,470 km (0.07 R)
• M13: 4,075,944 km (0.039 R)
• M14: 4,184,252 km (0.105 R)
• M15: 4,570,963 km (0.067 R)
• M16: 5,231,737 km (0.119 R)
• M17: 5,648,666 km (0.11 R)
• M18: 5,739,472 km (0.057 R)
• M19: 6,674,159 km (0.07 R)
• M20: 7,622,460 km (0.116 R)
• M21: 7,993,313 km (0.075 R)
• M22: 8,163,855 km (0.043 R)
• M23: 8,823,133 km (0.108 R)
• M24: 10,008,546 km (0.107 R)
• M25: 10,192,552 km (0.076 R)
• M26: 10,303,404 km (0.026 R)
• M27: 10,676,202 km (0.095 R)
• M28: 10,788,849 km (0.076 R)
• M29: 10,901,945 km (0.108 R)
• M30: 11,666,091 km (0.067 R)
• M31: 11,821,074 km (0.083 R)
• M32: 12,172,031 km (0.108 R)
• M33: 12,408,096 km (0.098 R)
• M34: 12,526,578 km (0.044 R)
• M35: 12,804,680 km (0.103 R)
• M36: 13,245,994 km (0.108 R)
• M37: 13,855,605 km (0.115 R)
• M38: 14,391,465 km (0.093 R)
• M39: 14,850,281 km (0.041 R)
• M40: 15,271,549 km (0.118 R)
• M41: 15,441,043 km (0.1 R)
• M42: 15,611,286 km (0.116 R)
• M43: 15,910,781 km (0.05 R)
• M44: 16,255,305 km (0.075 R)
• M45: 16,471,922 km (0.09 R)
• M46: 16,645,905 km (0.12 R)
• M47: 16,908,000 km (0.066 R)
• M48: 17,347,818 km (0.097 R)
• M49: 17,880,685 km (0.108 R)
• M50: 18,014,725 km (0.08 R)
• M51: 18,871,622 km (0.037 R)
• M52: 19,099,310 km (0.102 R)
• M53: 19,373,822 km (0.109 R)
• M54: 19,511,601 km (0.1 R)
• M55: 20,344,712 km (0.067 R)
• M56: 20,625,058 km (0.112 R)
• M57: 22,333,915 km (0.114 R)
• M58: 25,131,245 km (0.104 R)
• M59: 26,037,360 km (0.036 R)
• M60: 26,851,920 km (0.106 R)
• M61: 27,108,181 km (0.097 R)
• M62: 27,519,875 km (0.096 R)
• M63: 28,610,294 km (0.094 R)
• M64: 31,695,151 km (0.051 R)
• M65: 32,074,531 km (0.091 R)
• M66: 32,237,593 km (0.079 R)
• M67: 32,619,217 km (0.081 R)
• M68: 33,002,337 km (0.092 R)
• M69: 33,166,895 km (0.101 R)
• M70: 33,386,804 km (0.078 R)
• M71: 33,552,110 km (0.115 R)
• M72: 34,049,523 km (0.025 R)
• M73: 34,549,479 km (0.115 R)
• M74: 35,500,323 km (0.114 R)
• M75: 36,063,708 km (0.041 R)
• M76: 36,857,325 km (0.109 R)
• M77: 38,116,341 km (0.096 R)
• M78: 38,346,721 km (0.098 R)

Planet 5 - Gas Giant

Semi-Major Axis: 8.73 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 208.1

Radius: 8

Gravity: 3.25 G

Time & Orbit

Eccentricity (e): 0.151

Orbit Range: 7.41 AU - 10.05 AU

Year: 9024 Days

Day: 9.1 Hours

Environment

Temp: -169 °C

Axial Tilt: 21.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 70,873,027 km

• M1: 125,064 km (0.087 R)
• M2: 247,584 km (0.041 R)
• M3: 678,875 km (0.04 R)
• M4: 1,005,597 km (0.032 R)
• M5: 1,653,655 km (0.067 R)
• M6: 1,789,789 km (0.107 R)
• M7: 2,332,829 km (0.116 R)
• M8: 2,408,975 km (0.113 R)
• M9: 2,965,030 km (0.049 R)
• M10: 3,450,774 km (0.085 R)
• M11: 5,225,902 km (0.091 R)
• M12: 5,553,821 km (0.098 R)
• M13: 5,784,800 km (0.119 R)
• M14: 6,523,664 km (0.105 R)
• M15: 7,460,147 km (0.086 R)
• M16: 7,629,791 km (0.119 R)
• M17: 7,886,650 km (0.044 R)
• M18: 8,233,568 km (0.077 R)
• M19: 9,032,271 km (0.099 R)
• M20: 10,480,976 km (0.102 R)
• M21: 10,990,357 km (0.1 R)
• M22: 11,312,890 km (0.044 R)
• M23: 11,442,741 km (0.077 R)
• M24: 11,901,259 km (0.116 R)
• M25: 12,299,039 km (0.083 R)
• M26: 13,278,457 km (0.118 R)
• M27: 14,037,965 km (0.038 R)
• M28: 18,117,499 km (0.116 R)
• M29: 18,498,525 km (0.083 R)
• M30: 19,229,460 km (0.115 R)
• M31: 19,618,115 km (0.092 R)
• M32: 19,891,580 km (0.084 R)
• M33: 20,799,190 km (0.082 R)
• M34: 21,318,145 km (0.086 R)
• M35: 21,559,148 km (0.093 R)
• M36: 21,639,631 km (0.093 R)
• M37: 21,801,047 km (0.078 R)
• M38: 21,922,371 km (0.085 R)
• M39: 22,328,230 km (0.107 R)
• M40: 22,859,452 km (0.092 R)
• M41: 24,899,518 km (0.077 R)
• M42: 24,984,041 km (0.109 R)
• M43: 25,195,722 km (0.07 R)
• M44: 25,578,094 km (0.061 R)
• M45: 25,663,365 km (0.042 R)
• M46: 26,134,000 km (0.067 R)
• M47: 26,305,888 km (0.08 R)
• M48: 26,997,030 km (0.087 R)
• M49: 28,132,777 km (0.1 R)
• M50: 28,839,478 km (0.109 R)
• M51: 29,061,630 km (0.107 R)
• M52: 29,462,702 km (0.09 R)

Planet 6 - Ice Giant

Semi-Major Axis: 13.86 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 679.5

Radius: 6.9

Gravity: 14.27 G

Time & Orbit

Eccentricity (e): 0.213

Orbit Range: 10.91 AU - 16.81 AU

Year: 18052 Days

Day: 21.5 Hours

Environment

Temp: -183 °C

Axial Tilt: 31.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 70,873,027 km

• M1: 103,671 km (0.095 R)
• M2: 242,648 km (0.083 R)
• M3: 301,290 km (0.087 R)
• M4: 472,131 km (0.048 R)
• M5: 1,481,917 km (0.059 R)
• M6: 1,568,982 km (0.084 R)
• M7: 1,657,544 km (0.096 R)
• M8: 1,840,054 km (0.074 R)
• M9: 2,061,159 km (0.1 R)
• M10: 2,494,245 km (0.07 R)
• M11: 2,563,360 km (0.105 R)
• M12: 3,327,505 km (0.096 R)
• M13: 3,403,800 km (0.092 R)
• M14: 3,675,320 km (0.1 R)
• M15: 4,075,495 km (0.119 R)
• M16: 4,489,432 km (0.117 R)
• M17: 5,179,377 km (0.111 R)
• M18: 5,223,658 km (0.099 R)
• M19: 5,536,767 km (0.085 R)
• M20: 5,764,156 km (0.108 R)
• M21: 6,181,234 km (0.111 R)
• M22: 6,849,339 km (0.11 R)
• M23: 8,304,776 km (0.119 R)
• M24: 8,512,867 km (0.108 R)
• M25: 8,670,094 km (0.115 R)
• M26: 9,470,443 km (0.027 R)
• M27: 10,969,563 km (0.096 R)
• M28: 12,362,918 km (0.077 R)
• M29: 14,305,745 km (0.089 R)
• M30: 15,952,818 km (0.106 R)
• M31: 17,193,882 km (0.081 R)
• M32: 17,926,612 km (0.095 R)
• M33: 18,737,433 km (0.063 R)
• M34: 19,560,221 km (0.108 R)
• M35: 20,394,827 km (0.055 R)
• M36: 20,675,623 km (0.12 R)
• M37: 21,596,846 km (0.049 R)
• M38: 22,170,554 km (0.119 R)
• M39: 23,406,083 km (0.086 R)
• M40: 23,995,199 km (0.079 R)
• M41: 24,291,553 km (0.032 R)
• M42: 26,476,430 km (0.061 R)
• M43: 27,553,534 km (0.071 R)
• M44: 28,409,832 km (0.092 R)
• M45: 28,880,617 km (0.05 R)
• M46: 29,433,082 km (0.091 R)
• M47: 30,228,344 km (0.057 R)
• M48: 31,515,484 km (0.052 R)
• M49: 31,677,648 km (0.091 R)
• M50: 33,644,860 km (0.113 R)
• M51: 34,392,850 km (0.104 R)
• M52: 35,314,373 km (0.077 R)
• M53: 35,567,043 km (0.112 R)
• M54: 36,925,093 km (0.105 R)
• M55: 37,696,419 km (0.038 R)
• M56: 37,868,607 km (0.082 R)
• M57: 39,604,241 km (0.112 R)
• M58: 40,393,669 km (0.044 R)
• M59: 40,569,895 km (0.075 R)
• M60: 41,543,179 km (0.117 R)
• M61: 42,077,393 km (0.068 R)
• M62: 42,345,323 km (0.076 R)
• M63: 43,062,495 km (0.101 R)
• M64: 43,603,142 km (0.11 R)
• M65: 44,600,062 km (0.028 R)
• M66: 44,873,228 km (0.071 R)
• M67: 44,964,482 km (0.053 R)
• M68: 46,063,428 km (0.11 R)
• M69: 49,131,082 km (0.092 R)
• M70: 51,594,211 km (0.112 R)
• M71: 52,360,003 km (0.079 R)
• M72: 53,033,343 km (0.03 R)
• M73: 53,226,174 km (0.1 R)
• M74: 54,388,400 km (0.112 R)
• M75: 55,461,167 km (0.093 R)
• M76: 55,656,990 km (0.06 R)
• M77: 55,951,100 km (0.112 R)
• M78: 58,422,008 km (0.106 R)
• M79: 59,120,181 km (0.037 R)
• M80: 59,821,197 km (0.118 R)
• M81: 61,231,456 km (0.069 R)
• M82: 61,535,139 km (0.105 R)
• M83: 63,367,264 km (0.098 R)
• M84: 63,776,863 km (0.088 R)
• M85: 65,527,458 km (0.097 R)
• M86: 67,085,071 km (0.115 R)
• M87: 69,497,187 km (0.062 R)
• M88: 69,708,269 km (0.116 R)

Kuiper Belt

Range: 31.4 - 59.4 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 420 - 15,970 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit